Aisan Kogyo Kabushiki Kaisha

Sumito Takeda

Masaki Ikeya

Yuichi Manabe

Yoshihiko Honda

Shinichi Fujii

In a liquid level detector, a first clearance may expand as at least one of a rotator and a supporter swells with a target liquid. The first clearance may be a smaller one of an inner clearance between an inner circumference side of a first guide rail and an inner circumference portion and an outer clearance between an outer circumference side of the first guide rail and the outer circumference portion, in a state where the rotator and the supporter are not swelled with the target liquid. A second clearance may contract to become smaller than the first clearance as at least one of the rotator and the supporter swells with the target liquid. The second clearance may be a larger one of the inner clearance and the outer clearance in the state where the rotator and the supporter are not swelled with the target liquid.

Liquid level detector

A liquid level detector may include a rotator fixed to an arm, a magnet fixed to the rotator, and a supporter rotatably supporting the rotator. The supporter may include a body, and an outer circumference wall disposed along a rotation direction of the arm on an outer circumference side of the magnet. The rotator may include a cover covering an end part of the outer circumference wall, and an opposing wall opposing at least one of an inner circumference surface and an outer circumference surface of the outer circumference wall. A first clearance between the supporter and the magnet may communicate with an outer space via a second clearance between the outer circumference wall and the cover and a third clearance between the outer circumference wall and the opposing wall. The first clearance may be larger than at least one of the second clearance and the third clearance.

Fuel pump ()comprises a casing () and an impeller (). A group of concavities () are formed in an upper or a lower face of the impeller. A groove () communicating a discharge hole () is formed in a inner face of the casing. The groove has an opening portion () that directly communicates with the discharge hole. The opening portion is shaped so as to extend in the rotation direction of the impeller, within a span extending from a position corresponding to substantially the central position of the concavities of the impeller, in the radial direction thereof, to a position corresponding to substantially the outer peripheral edge of the concavities of the impeller. The opening portion is be formed so as to extend in the rotation direction of the impeller beyond the position () where the inner peripheral edge connects therewith.

Fuel pump

An integrally formed cylinder having alternating magnetic and non-magnetic portions for use in an injector. At least two solenoid coils are disposed about the cylinder to urge an armature to open and close a valve . The non-magnetic portions of the cylinder ensure that magnetic paths for opening and closing the valve are magnetically insulated from each other. The integrally formed cylinder 2 is leak proof and thus does not require O-rings or other sealing structures for sealing the fuel path from the solenoid coils . A protrusion may be formed on the cylinder to assist in positioning the solenoid coils

Injectors

The fuel injection valve of the present invention is constituted such that a needle valve and a movable core are movably disposed in an axial direction in the inside of a body . Here, a fixed member which the movable core approaches at the time of closing the valve is disposed in the body , and a gap is formed between the movable core and the fixed member at the time of closing the valve. When fuel remaining in the gap between the movable core and the fixed member is pressurized according to the movement of the movable core to the valve closing side, a squeezing portion SB is disposed at a portion which constitutes a passage for the fuel extruded from the gap. At the time of closing the valve, a squeezing reaction force (reaction force against the squeezing-out force or pushing-out force generated at the time of pressurizing a liquid and squeezing a liquid through the gap) is generated on the movable core . Since the squeezing reaction force is increased in an inversely proportional manner to the cube of the size of the gap between the movable core and the fixed member , even when the gap between two opposing surface (that is, the gap between the proximal end surface of the fixed member and the distal end surface of the movable core ) is small, a large squeezing reaction force is generated. Further, a braking is quickly applied to the movable core and and the needle valve due to this squeezing reaction force just slightly before the point of time when the valve is closed.

Growing community of inventors

Obu, Japan

Sumito Takeda